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Latin term (adsorbere = to suck in) for the ability of solids to attract and deposit gases or dissolved particles on their surface. Activated carbon, alginates, bentonite, various resins and silica sol, for example, possess this ability to a high degree. This is used in filtration and wine fining to remove certain substances. The different electrical charges of filter fibres and clouding substances (microscopic particles) attract the latter and stick to them.

Such substances must not be stored near strong smelling substances such as diesel oil or petroleum. Since they can naturally absorb ambient sounds very easily, this can lead to fining defects in the course of vinification. Various wine filtration techniques are also based on adsorptive effects. Absorption, on the other hand, is the diffusion of substances into the interior of a solid or liquid; see taste absorption.

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